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In DeltaABC, 1/a,1/b,1/c are in A.P. pro...

In `DeltaABC`, `1/a,1/b,1/c` are in A.P. prove that `"cosec"^(2)A/2, "cosec"^(2)B/2, "cosec"^(2)C/2` are also in A.P.

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